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Product Warranty - Reconciliation of Reserve for Warranty Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]        
Beginning balance $ 11,533 $ 9,779 $ 9,364 $ 9,636
Provision 1,938 2,137 7,871 5,507
Claims paid/costs incurred (1,950) (2,276) (5,714) (5,503)
Ending balance $ 11,521 $ 9,640 $ 11,521 $ 9,640